18039122720 has 48 divisors (see below), whose sum is σ = 42636880440. Its totient is φ = 7212355584.

The previous prime is 18039122719. The next prime is 18039122729. The reversal of 18039122720 is 2722193081.

It can be written as a sum of positive squares in 4 ways, for example, as 14240126224 + 3798996496 = 119332^2 + 61636^2 .

It is not an unprimeable number, because it can be changed into a prime (18039122729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342296 + ... + 391464.

Almost surely, 2^18039122720 is an apocalyptic number.

18039122720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18039122720 is an abundant number, since it is smaller than the sum of its proper divisors (24597757720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18039122720 is a wasteful number, since it uses less digits than its factorization.

18039122720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51477 (or 51469 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 18039122720 in words is "eighteen billion, thirty-nine million, one hundred twenty-two thousand, seven hundred twenty".